Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a59df3ce87df8cd260274668f86a8b63ad05c007e06a1e97b811a74034ca7e4d' 
  AND token = 'z6Cy4YP1PzZpcNo+PWIdS8GWuujYJiTGk2fzK7xnt8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}